Plasmon-enhanced quadrupole transitions of Rydberg excitons in Cu2O

TL;DR

This paper explores how plasmonic nanostructures can amplify weak quadrupole transitions of Rydberg excitons in Cu₂O, providing a theoretical framework and evaluating different metal-based nanostructures for enhancement.

Contribution

It introduces a theoretical model for exciton-plasmon interaction and proposes a field averaging approximation for large excitons, assessing various nanostructures for transition enhancement.

Findings

Plasmonic nanostructures can significantly enhance quadrupole transitions.

Theoretical description of exciton-plasmon interaction is developed.

Different metals like copper, silver, and gold are evaluated for effectiveness.

Abstract

A mechanism for amplification of weak quadrupole transitions of Rydberg excitons in Cu$_2$O by a plasmonic nanostructure is investigated. The theoretical description of exciton-plasmon interaction is presented and a field averaging approximation is proposed for calculations involving large excitons. Various types of copper, silver and gold-based plasmonic nanostructures are considered and their potential for enhancing quadrupole transitions is evaluated.